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Avaliação do efeito de restaurações com fresagem e recapeamento nas condições funcional e estrutural de pavimentos com volume de tráfego médio
| Content Provider | Semantic Scholar |
|---|---|
| Author | Echeverria, José Antônio Santana |
| Copyright Year | 2011 |
| Abstract | ECHEVERRIA, J.A.S. Evaluation of the Effects of a Milling and Asphalt Concrete Substitution on the Functional and Structural Conditions of Medium-Traffic Roads Pavements. 2011. MSc Dissertation – Post-Graduation Program on Civil Engineering, UFRGS, Porto Alegre, RS, Brazil. This Dissertation reports the main findings of a research on the effects of a basic rehabilitation procedure (milling and replacing the distressed asphalt wearing course by a new layer of asphalt concrete) on functional and structural parameters of two test sections of mediumtraffic roads in the Northwestern Region of Rio Grande do Sul State, Brazil. Both test sections are placed in a Geomorphological Unit called “Planalto Meridional” (South Plain) and subgrade soils are pedologycally classified as red latosols. Regarding the pavements functional condition, the following parameters were evaluated: roughness (IRI – International Roughness Index), macrotexture and a Brazilian Global Severity Index (IGG – “Indice de Gravidade Global”), which is computed considering the severity and the frequency of a set of pavement distresses. In order to evaluate the pavements structural capacity, trenches were opened, in situ moisture content and dry density of base, sub-base and subgrades were measured and materials were sampled in order to carry out laboratory tests. Surface deflections were measured using a Benkelman Beam. Roughness and deflections were measured before and after rehabilitation, while macrotexture was measured on the new asphalt layer. Laboratory procedures consisted of gradation, Atterberg Limits, compaction, CBR and resilient modulus tests; the Sand Equivalents of base and sub-base aggregates were also determined. Pavement Prediction Models were used to estimate roughness and deflection decreases due to the rehabilitation procedure; these estimations were compared to the differences between roughness or deflection before and after rehabilitation. By means of Statistics analysis, a tendency line that allows estimating deflection reduction due to the rehabilitation procedure was defined. That tendency line might be used to estimate deflection reduction in similar pavements of the Northwestern Region of the state. Rut depth values measured with a three-point ruler were compared to values measured with a laser profiler; it was shown that both sets of values are quite different. All in all, it was verified that the rehabilitation procedure (milling and replacing the distressed asphalt wearing course by a new layer of asphalt concrete) provided the studied pavements adequate bearing capacity and improved their serviceability (parameter related to safety and confort). Key-words: pavement, rehabilitation, evaluation, functional, structural. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.lume.ufrgs.br/bitstream/handle/10183/38794/000822202.pdf?isAllowed=y&sequence=1 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
